I purchased an art work online for a book. The rights were full for that piece of art. The problem is it is a full real likeness of a person. So there is some issues if I used an AI to generate more of it, due to personal likeness.
If an artist does not specify rights they do not suddenly gain rights, the only reasonable protection is against the likeness of a person or existing art. I can do a replication of the Mona Lisa but not of Mickey Mouse for example, due to the copyright on Mickey, even if I bought a Mickey Mouse image (like a comic book or such).
I also had an artwork commissioned for a book, no other art is similar, no other person or protected piece is included, and relations with the original artist have soured due to politics (and his failure to produce an art after taking money). I can create similar art or hire others to create similar art with no issues whatsoever.
You are clearly unversed in this and wish to try to create issues from nothing Artroll.
creating similar art and hiring people to create similar art is not at all the same as using the artists art to train a computer to replicate their art. and you're wrong on the artist specifying rights part. the purchaser of commissioned art does NOT own the ip or copyright and is not allowed to reproduce the art unless otherwise specified in the contract. in the U.S. at least unless explicitly stated in the contract the commissioner owns no rights to the art and can do nothing with it outside of the original terms. The original artist can do whatever they want with the art unless otherwise specified in the contract. If the creator published or sold the chet/chloe and other character arts as their own pieces theres nothing the dev can do about it if they didn't specify exclusive ownership in the contract. As for the dev team, they own no rights to the ip or the copyright and can only use the art as specified in the commission.
As i said before AI legislation is severely lacking at present so the devs might not be doing anything technically illegal at present by using the commissioned art to train an algorithm to reproduce it but that doesnt mean they have the rights to.
Also you said you purchased the FULL rights to the art for the book. unless the artist or the dev reveals the details of the contract for the commissioned art we can only go by how the rights would play out in a general contract.
There is a big difference in people using commissioned art for inspiration, and feeding it to a computer to reproduce that artists work and style without their input. Unfortunately when it comes to ai art neither of us is correct or incorrect at this time as the legal framework surrounding ai art pales in comparison to that surrounding human made art. It is my opinion that training on commissioned art is equivalent to forgery if done without the artists permission. you may believe otherwise but at present there is not a definitive answer.
In any case, i've wasted enough time arguing with strangers on the internet. if you've got something to say that doesn't rely on calling me an artroll to dismiss what i said ill hear you out. Otherwise im done with this, have a nice day/night whatever